Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,439 pages of information and 230,054 images on early companies, their products and the people who designed and built them.

Simplex Electric Co

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April 1945.
August 1945.
October 1945.
June 1953.
September 1953. Lundberg Switches.
February 1968. Wrighton and the Simplex Electric Co.

of Empire House, 159 Great Charles Street, Birmingham, 3. Telephone: CENtral 7777. Telegraphic Address: "Empirical, Birmingham". (1937)

'Credenda' Works in Oldbury, Worcestershire; 'Simplex' Works in Garrison Lane, Birmingham.

1919 Tube Investments was registered as a public company combining the seamless steel tube manufacturing companies of Tubes Limited, Credenda Conduits Co, Star Tube Co and St. Helen's Tube and Metal, as well as Simplex Conduits Ltd[1][2].

1932 Recognising the scope for improvement in the management of its electrical subsidiaries, Tube Investments formed a new organisation that would be responsible for the manufacture and sale of electrical products[3]. Simplex Conduits merged with Credenda Conduit Co to form Simplex Electric Co which began to manufacture Creda domestic cooking appliances in addition to lighting equipment and conduits[4].

1933 Creda electric cooker with oven. With a cast metal hotplate-griller and a red-ring hotplate (later addition). One of the early electric cookers to be fitted with a Credastat automatic oven thermostat - patented by the Credenda Conduit Co Ltd, Birmingham 1931. Whole cooker enamelled in mottled pale grey, made by Simplex Electric Co Ltd, of Birmingham. Used daily in the donor's home from 1934 to 1967. Credastat was an optional extra on Creda cookers at this time. Inscription on oven door: Creda/BRITAINS BEST/ELECTRIC. Made by Simplex Electric Co - Birmingham[5]

1937 British Industries Fair Advert for 'Creda' Electric Cookers; Fires; Water Heaters; Tubular Heaters; Wash Boilers; Irons; Kettles; Toasters; canteen Equipment, etc. and 'Simplex' Electrical Installation Equipment, comprising Conduits, Fittings, Switchgear, Industrial Lighting Equipment, Flameproof Lanterns, Floodlights, Mersey Cables. (Electricity: Industrial and Domestic Section - Stand Nos. Cb515 and Cb.414) [6]

1961 Patent - Improvements in and relating to electric immersion water heaters. [7]

1962 Patent - Improvements in and relating to electric switchboards. [8]

1965 Simplex Electric Co was fully owned by Tube Investments until 1965 when it was bought by General Electric of USA[9].

1967 The original company name, Simplex Steel Conduit Co, had been brought back into use for electrical conduit.

See Also


Sources of Information

  • [7] Light Bulbs
  1. [1] Wikipedia
  2. The Times, 14 February 1961
  3. The Times, 6 December 1932
  4. Material relating to Simplex Electric Company Ltd [2]
  5. Science and Society Picture Library: [3]
  6. 1937 British Industries Fair p582; and p413
  7. [4] Wikipatents
  8. [5] Wikipatents
  9. Material relating to Simplex Electric Company Ltd [6]